Grinding-wheel shaft and bearing.



A. IVI. DRAKE. GRINDING WHEEL SHAFT AND BEA-RING.A

APPLICATION HLED SEPT. l5, i915. L l l 9m Patented May 9, 1916.

`\ n 1 WV l 2 vrr-tzznv.. L L

a L ci E i i 1X0 I l Wa'fzds v :j z

ALBEN' IVI. BRAKE, 03F WORCESTER, IMASSACHUSEETTS, ASSIG'NOR TO HEALD MACHINE COMPANY, 0F WORCESTER, 'VMASSACI-IUSETYTS, A

GrlltNlDING-WHEEL SHAFT AND BEARING.

arenoso.

Application filed. September 15, 1915. Serial No. 50,884.

Torall 'whom t may concern: l

Be it known that l, ALBEN M. Dimmi,

a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new ,and useful Grinding-Wheel Shaft and Bearing, tion. l

This invention relates to a grinding wheel shaft and bearingsand particularly to improved devices for moving the shaft longigrinding Wheel rela of which the following is a specifica tively to the work. f

While my invention is` capable of general applicatiom I have shown it hereinv as J embodied in a surface grinding machine in which a cup grinding wheel is used. ln

lthis type of machine, the grinding wheel is a vertical wheel carried at the lower end o and, -as commonly constructed, the

shaft ywheel shaft is mounted inbearings in a ver ltically movablel wheel slide.

slide is necessarily of substantial weight andbodily adjustment thereof` is not Fsatisfac- This wheel tory for the final vertical adjustment `ot the grinding wheel, E c Y llt is the. principal object 'of my inveny 'tion to provide fimproved devices for securing close vertical adjustment of the grinds ing wheel relatively tothe work independently of the adjustment of the slide.

With this Lobject in view, one feature' of my invention relates tothe provision of a supplementary adjusting mechanism by which the grinding wheel shaft may be adf justed relatively to the wheel slide.

Further features of my invention relate tothe provision of means for preventing back-lash between the wheel shaft and slide, Aand to means for-forcing the wheel shaft at all times vertically upward into rm engagement with the wheelslide. r

My invention further relatesto certain arrangements and combinations of .parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in-whichy j l `igurey 1 is a vertical sectional-view of a portion of a-.wheel slide withlmy improved shaftiand bearing mounted thereon; Fig. 2 isa detail side elevation of a portion of the adjusting nut, looking in theA direction of Specication of Letters Patent.

. of the standard l1.

CORPORATION 0F MASSACHUSETTS.

Patented May u, 191m.

the arrow 2 in Fig. l, and Fig. 3v is apar-` tial end elevatign of a surface. grinding machine, showing the mechanism for manually moving the adjusting, nut.

Referring to the drawings, l have indi cated in Fig-3 a surface grinding machine having a base 10, a standard 11, and a work table 12,' all fof vthe u sual` form. A wheel shaft 13 (Fig. 1) is mounted .in bearings in a wheel slide 14 which is vertically adjustable upon ways l5 :formed on the front face shown) for vertically adjusting the wheel slide and for retaining the same in adjusted position upon the standard 11 may be of any suitable or convenient tot "lFh'e mechanism (not supports a cup grinding wheel 17, cemented or otherwise secured in a ring 1S which is fastened to a face j The face plate 19 is keyed to the tapered lower end of the shaft 13 and is secured thereon by a binding nut2l, all of the usual construction.

plate 19 by'screws 20.

the Shaaia is mounted to rotate in upl per/ and lower ball thrust bearings 210 and 211, the outer portionsof which are carried by a sleeve `22. The outer portion of the lowei" bearing 210 engages a shoulder 22a upon the sleeve 22, and the outer portion of the upper bearing '-211 engages a shoulder '22" upon the` sleeve 22.

'lhese parts are held closely in engagement with each other by afseries ofsprings 23 mounted in recesses` in a. collar 24 slidablebut non-rotafitable upon the-shaft 13. The collar 24 furnishes a support for. the inner portion of the7 upper ball bearing 211I and is forced thrust of the springs 23.

WThe upward thrust of the springs is coinmunicated through sliding .pins 25`to a collar 26 threaded to the shaft 13 and secured yieldingly downward by the downward 4in adjusted position thereon by a set screw f 2'?. Through the collar 26 and the shaft 13,

the upward thrust ofthe springs 23 is transmitted to the face plate 19 and thus forces the lower thrust bearing 2l@ upward into engagement with the shoulder 22a. "At the `same time the weight of the shaft 13 and vwheel 1? and the downward thrust of the .springs 23 moves the slidingv collar 241 down;

uit

thereto by a stud 42 mounted in the ring 41 wardly until the upper thrust bearing 211 firmly engages the shoulder 22h, thus eliminating all back-lash between the shaft 13 and the sleeve 22.

The sleeve 22- is keyed to slide vertically in a projecting portion ofthe slide 14. In order to provide for a close vertical adjustment of the grinding shaft and wheel, the sleeve 22 is screw-threaded upon its outer cylindrical surface, and an adjusting nut 28 is mounted between shoulders in a recess in the slide 14 to coperate therewith.

The nut 28 is provided with gear teeth 29 upon its outer surface and may be conveniently adjusted by ahand wheel 30 (Fig. 3), the connection from the hand wheel to the adjusting nut including a shaft 31, bevel gears 32 and 33, a vertical shaft 34 keyed to the gear 33 but slidable therein, a gear 35 carried by the shaft 34, and an idle gear 36 meshing with the gear 35 and also with the teeth 29 upon the adjusting nut 28.

To secure a close t between the nut 28 and the threads upon the sleeve 22, I form the nut in two parts 28a and 28h, said parts being .capable of limited angular adjustment, and being secured in adjusted position by a screw 37 extending through a horizontal'slot k38v (Fig. 2) in the portion 28a of the nut 28, and threaded into the portion 28b thereof.

In order to take up the back-lash between the nut 28 and the slide 14, I provide a series of springs 40 inserted in recesses in the nut portion 28b and engaging at their' lower ends a bearing ring 41. The ring 41 is rotatable with the nut 28, being connected and extending upwardly into a hole 43 `in the nut Portion 28". The action of the springs 40 is similar to that of the springs 23 previouslydescribed, the upward thrust of the springs forcing the nut 28 firmly into engagement with the upper shoulder kof the wheel slide 14.

Having thus described the details of my invention the operation thereof will be apparent. The rough vertical adjustment of the cup wheel 17, relatively to the work carried by thetable 12, may be secured by adjusting the wheel slide 14 upon the standard 15. Having brought the grinding wheel to its appropriate working position by this means, the final close adjustment may be secured by angular movement of the adjusting nut 28, such movement being conveniently obtained by the use of the hand wheel 30 and the connections described. The springs 40 force the nut firmly into engagement with the upper shoulder of the slide 14 and the springs '23 force the grinding wheel shaft andV its associated bearings firmly into engagement with the shoulders of the sleeve v22. I thus provide a lconvenient arrangement for close and accurate vertical adjustment of the wheel shaft and I at all times take up the back-lash between the parts so that the grinding wheel will be firmly supported against the upward thrust of the work.

Having thus described my invention, it will be evident that changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope thereof as set forth in the claims, and I do not wish to be otherwise limited to -the details herein disclosed but What I claim is 1. In a grinding machine, in combination, a standard, a vertically movable wheel slide supported on said standard, a wheel shaft mounted in bearings in said slide, a sleeve supporting said bearings, said sleeve being screw-threaded upon its outer cylindrical surface and being vertically movable but non-rotatable in said slide, a nut mounted in said slide, and means to rotate said nut to thereby adjust said sleeve vertically in the slide.

2. In a grinding machine, in combination, a standard, a vertically movable wheel slide supported on said standard, a wheel shaft mounted in bearings in said slide, a sleeve supporting said bearings, said sleeve bein@r screw-threaded upon its outer cylindrical surface and being vertically movable but non-rotatable in said slide, a nut rotatable between upper and lower shoulders on said slide, means to rotate said nut, and means to force said nut yieldingly upward against the upper shoulder.

3. In a grinding machine, in combination, a standard, a vertically movable wheel slide supported on said standard, a wheel shaft mounted in bearings in said slide, a sleeve supporting said bearings, said sleeve being screw-threaded upon its outer cylindrical surface and being vertically movable but non-rotatable in said slide, a nut rotatable between upper and lower shoulders on said slide, a plurality of coiled springs seated in -recesses in said nut and a bearing ring rotatable with said nut and forced by said springs into engagement with said lower shoulder, the reaction of said springs on said nut forcing the nut upwardly into engagement with the upper shoulder.

4. In a grinding machine, in combination, a standard, a vertically movable wheel slide supported on said standard, a wheel shaft 'mounted in bearings in said slide, a sleeve supporting said bearings, said sleeve being screw-threaded upon its outer cylindrical surface and being vertically movable but non-rotatable in said slide, a nut formedin two relatively movable parts, means to hold said parts in adjusted position, one of said parts engaging the upper shoulder on said slide, and the other part having a plurality of springs seated and axially extensible therein, and a bearing ringrottable with supported on said standard,`e wheel shaft mounted in bearings in said slide, en externally threaded sleeve supporting seid bearings, yielding means to force seid beermeme@ tt ings upwardly into close engagement with m said sleeve, a nut for adjusting -seid sleeve axially,Y said nut being rotatable between upper and ylower shoulders on saidv slide, and

yielding means to force seid nut into engagement with said upper shoulder. 15

in testimony whereof 1I have hereunto set m hand. f.

y' ALBEN M. DRAW? 

